05000280/LER-1982-071

LER 82-071/03L-0:on 820618,motor Operated valve-1536 Pressure Power Operated Relief Block Valve Was Cycled Open But Failed to Close Fully,Remotely or Manually.Cause Undetermined.Valve Closed Electrically

ML20055B738
Person / Time
Site:	Surry
Issue date:	07/16/1982
From:	Joshua Wilson VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20055B734	List: 05000280/LER-1982-071 05000280/LER-1982-073 ML20055B733
References
LER-82-071-03L, LER-82-71-3L, NUDOCS 8207230226
Download: ML20055B738 (2)

LER-2082-071,

Event date:
Report date:
2802082071R00 - NRC Website

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.: : i  ; With the unit at full nower while nerformine PT-2.26, MnV-1536 Prewirizer popV I

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ATTACH!iENT 1 SURRY POWER STATION, UNIT NO. 1

• DOCKET NO: 50-280 REPORT NO: 82-071/03L-0 E"ENT DATE: 06-18-82 TITLE OF THE EVENT: MOV-1536 Failed to Close

1. DESCRIPTION OF THE EVENT:

With the unit at full power while performing PT-2,16 (Reactor Coolant System Pressure test), MOV-1536 (Pressurizer PORV block valve) was cycled open but would not fully close remotely or manually. The valve was torque closed electrically, de-energized, and declared inoperable. This is contrary to T.S .-3.1. A.6 and is report able per T.S. -6.6. 2.b(2) .

2. PROBABLE CONSEQUENCES:

The PORV block valves are intended to provide positive shutoff capability if a relief valve becomes inoperable. Since MOV-1536 was closed and power removed from it as required by Tech. Specs., the health and safety of the public were not affected.

3. CAUSE:

The cause of the MOV failure to close is unknown at this time. The valve will be inspected during the next outage of sufficient duration.

4. IMMEDIATE CORRECTIVE ACTION: .

An unsuccessful attempt was made to close MOV-1536 from the Control Room immediately, followed by the dispatching of an operator to the valve.

5. SUBSEQUENT CORRECTIVE ACTION:

The operator tried to close the valve manually, but the handwheel on the limitorque was loose and could not be used. The valve was closed when the i electricians electrically overrode the torque and limit switches.

6. ACTION TAKEN TO PREVENT RECURRENCE:

t The valve will be inspected during the next outage of sufficient duration.

A design change is being issued to replace this Limitorque operator as

! part of the Environmental Qualification Program.

7. GENERIC IMPLICATIONS:

Cannot be determined at this time.

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